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Multnomah County officials said the downtown bridge would be closed to all traffic from 6 a.m. Sept. 16 to about 10 p.m. Sept. 17. During the closure, Portland’s Streetcar staff will do work for upcoming bridge construction. Streetcar equipment needs to be adjusted before a contractor replaces four century-old steel Rall wheels and tracks that help the bridge open.

The Rall wheel contractor will slow bridge traffic to a single lane from 11 p.m. Monday, Sept. 18, until about 5 a.m. Tuesday, Sept. 19, to move the bridge’s concrete barriers.

Sidewalks will remain open for bicycles and pedestrians during the weekend and on Monday night.